Color psychology mostly used in advertising but this can vary in different culture. It is associating color to something. Example red is often associated with love (red rose) anger/ war (blood) white is to purity / authenticity (clinical labs) etc

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Color psychology is the study of color as something that explains and determines human behavior. Basically colors are the ones that effect how humans act and their personality types. Or, at least, that's what I think. I hope this helped :)